Cascading Failure Analysis of Transmission Tower-Line System Under Strong Wind
In order to analyze the cascading failure of the transmission tower-line system under strong wind,this paper took the collapsed transmission tower as the weak tower and used equivalent displacement to consider the influence of weak tower collapse on the spatial location of suspension points.The responses and failure characteristics of the adjacent transmission tower(target tower)under multiple combined groups of the weak tower collapse parameters were calculated,and the weak tower collapse parameters with the greatest influence on the target tower were determined.The results show that when cascading failure happens,the failure of the target tower includes two types,the failure of the tower body near the weak tower and the failure of the tower head.The main bracing on the leeward side of the weak tower has the highest stress ratio.The stress ratios of diagonal bracings are always low.The most direct causes of the overall collapse of the target tower are the instability of diagonal bracings at the lower part of the target tower and the continuous increase in stress of the main bracing.The duration of the weak tower collapse is the main control variable for the failure of the target tower.
万方数据
维普
